The CAS Registry Mumber 858-57-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,5 and 8 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 858-57: (5*8)+(4*5)+(3*8)+(2*5)+(1*7)=101 101 % 10 = 1 So 858-57-1 is a valid CAS Registry Number.
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